Second-harmonic generation in metal island films consisting of oriented silver particles of low symmetry
Second-harmonic generation in metal island films consisting of oriented silver particles of low symmetry
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由低对称性定向银颗粒组成的金属岛膜中的二次谐波产生
DOI：
10.1080/00268979000100941
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发表时间：
1990
影响因子：
1.7
通讯作者：
A. Leitner
中科院分区：
文献类型：
--
作者：
A. Leitner
本文提出了一种两步蒸发的新工艺，使银岛薄膜中的粒子具有平行取向和低对称性。与旋转对称的粒子在通常的方式制备的岛蒸发相比，这种粒子的薄膜显示二次谐波产生（SHG）的透射和反射时，照射垂直于基板平面。虽然银原子排列在中心对称的晶格中，但这种特别制备的岛状膜表现得像非中心对称材料的膜。由于粒子中的局域等离子体振荡共振，SH被强烈增强。测得的SH效率超过相同厚度的α-石英片的SH 104倍。
A new two-step evaporation technique has been developed by which the particles in a silver island film grow with parallel alignment and low symmetry. In contrast with rotationally symmetric particles prepared in the usual way of island evaporation, films of such particles shown second-harmonic generation (SHG) in transmission and reflection when irradiated normally to the substrate plane. Although silver atoms arrange in a centrosymmetric crystal lattice, such specially prepared island films behave like a film of a non-centrosymmetric material. Owing to localized plasma oscillation resonances in the particles, the SH is strongly enhanced. The measured SH efficiency exceeds the SH from an α-quartz sheet of equal thickness by a factor of order 104.